Parabolic antenna of a level measuring instrument and level measuring instrument with a parabolic antenna

Abstract

This invention concerns a parabolic antenna with a parabolic reflector ( 2 ) having a parabolic reflector rim ( 20 ), a collar ( 9 ), which is positioned on the parabolic reflector ( 2 ), in particular on the parabolic reflector rim ( 20 ) and which has an outside collar rim ( 90 ), and having an exciter and/or a receiver ( 3 ), such that the exciter and/or receiver ( 3 ) are/is located in the axial direction (X) partly within the parabolic reflector rim ( 20 ) and partly outside thereof.

1. Parabolic antenna of level measuring instrument with a parabolic reflector ( 2 ) having a parabolic reflector rim ( 20 );
 a collar ( 9 ), which is positioned on the parabolic reflector ( 2 ) and has an outside collar rim ( 90 ); 
 an exciter and/or receiver ( 3 ), configured so that the parabolic reflector ( 2 ) and the collar ( 9 ) transition into one another as a single piece and the exciter and/or receiver ( 3 ) located within the interior space enclosed by the parabolic reflector ( 2 ) and/or the collar ( 9 ); 
 the exciter and/or receiver ( 3 ) situated in an axial direction (X) partly within a parabolic reflector rim ( 20 ) constituting the transition between the parabolic reflector ( 2 ) and the collar ( 9 ), and partly outside of the parabolic reflector rim ( 20 ), and the exciter and/or receiver ( 3 ) positioned so the exciter and/or receiver ( 3 ) extend axially in a forward direction (X), but do not extend beyond the parabolic reflector ( 2 ) and collar ( 9 ). 
 
   
   
     2. Parabolic antenna according to  claim 1 , wherein the collar ( 9 ) is, at least on its interior, equipped with a material that absorbs the waves from the exciter. 
   
   
     3. Parabolic antenna according to  claim 1 , wherein the parabolic reflector ( 2 ) has a focal length (f) to diameter (D) ratio (f/D) of between 0.2 and 0.3. 
   
   
     4. Parabolic antenna according to  claim 1 , wherein the parabolic reflector ( 2 ) has a focal length (f) to diameter (D) ratio of approximately 0.27. 
   
   
     5. Parabolic antenna according to  claim 1 , wherein the parabolic reflector ( 2 ) and the collar ( 9 ) enclose an interior space, which is covered by a radome. 
   
   
     6. Parabolic antenna of a level measuring instrument according to  claim 5 , wherein the interior of the parabolic antenna is filled with a dielectric material. 
   
   
     7. Parabolic antenna according to  claim 1 , wherein the collar ( 9 ) is of a conical or cylindrical shape. 
   
   
     8. Level measuring instrument with a level measuring instrument parabolic antenna according to  claim 1 . 
   
   
     9. Parabolic antenna according to  claim 1 , wherein the parabolic reflector ( 2 ) has a focal length (f) to diameter (D) ratio (f/D) less than 1. 
   
   
     10. Parabolic antenna according to  claim 1 , wherein the parabolic reflector ( 2 ) has a focal length (f) to diameter (D) ratio (f/D) less than or equal to 0.6. 
   
   
     11. Parabolic antenna according to  claim 1 , wherein the parabolic reflector ( 2 ) has a focal length (f) to diameter (D) ratio of 0.2 to 0.3.